Log-gripping and -centering sawmill dog assembly



Sept. 30, 1947;v c. w. WALLACE LOG-GRIPPIHG AND CENTERING SAWMILL DGASSEMBLY Filed sept. 2o,v 1944 3 sheets-sheet 1 u. mm. Rf, .jxb`||nu|m|lmrlllllllmlulml|hll l l l l Il' .|O||||.|M|||| l bm ,N N .wwNN mm. uw NWN -l r w .um .o ffm. N 1 lm wwm ffff .dwwmaalladulw mi||`|lw| 1a| f v\ y N S. uw Q uN C/laude s epf. 3o, 1947.

LOG-GBIPPING AND CENTRING SAWMILL DOG ASSEMBLY c. w. WALLACE 2,428,185

Filed Sept. 20, 1944 3 Sheets-SheetZ Inventor:

ClaudeW/Vjzllac,

WWW/19%@ Sept.4 30, 1947.

LOG-GRIPPHG AND CENTERING. SAWMILL DOIGASSEMBLY Filed sept. 2o. 1944 :ssmetta-sham 's c. w. WALLACE 2,428,185 l Inventor;

claadewvwzza,

WWW m,

Patented Sept. 30, 1947 UNITED STATE LoGGmPrING AND -cENTEmNG sAwMlu.

` y DOG ASSEMBLY claude w. Wanne, columbia. unas. Application septemberzo, 1944,' serial No. 554,967'

1 claim. (cl. 14s-12s) The present invention relates to newand usefulmprovements in dogs or holding apparatus for logs particularly adaptedfor holding logs firmly against movement in saw mills while being sawed.-Y

lThe principal object of the present invention is to provide a, power`operated dog adapted to utilize fluid pressure such as steam for power.

quickly release the same when itis desired to move the log into a newposition or-release the same entirely. l

In thev drawings:

Figure 1 is a top plan view of the assembly.

Figure 6 is a fragmentary detailed sectional view taken 'on the line 6 6of Figure 3.`

Figure 7 is a sectional view showing the dog assembly engaging a 10g anda saw cutting through the log, said saw being shown in broken lines.

Referring to the drawings wherein like nu' merals'de'signate like parts.itvcan be seen that the dog assembly consists of a pair of elongatedchanneled members E, 5 held in spaced and secured relationv byinterposed U-shaped members 6 bolted or riveted in place as at Spanningone end portion of the thus constructed bed is a steam cylinder 3 havingfoot portions 9 bolted or otherwise secured as at l@ to the top anges ofthe channeled members 5.

Inthe cylinder 8 is a piston il from which a rod I2 extends through oneend of the cylinder Figure 7 shows consists of a-pair of arcuate jaws25, 26 pro-` vided with teeth 21 at the opposed sides thereof. The lowerportion of the 'inner faces of the jaws 25. 26 are provided with teeth28 which mesh so that the operation ofthe jaw 25 results in concurrentoperation of the'jaw 28. ,Y

The outer intermediate portion oi. the jaw l25 is slightly reduced as at29 to accommodate a knuckle 30 at the adjacent end of the link bar I4.The knuckle 30 is-interposed between a pair of ears 3i, 3i and a pin isdisposed throughthese ears and the knuckle 3 0 for pivotally connectingthe link bar i4 to the jaw 25.

The jaws 25, 2B are pivoted on pins 33 suitably mounted between thechanneled members 5 (seeFigure 4).

'Figure2isaside elevational view. It can now be seen, thatv when thehandle 22 Figure 3 is an enlarged' detailed sectional view is properlyoperated, steam will be admitted to 4vshowing gripping .iaWS Wlith HfB01111011 0f One in 2o the cylinder ilwhile moving the piston i I in onesection. direction or the other. If the piston is moved t0- Figure 4 isa section taken substantially on ward the right in Figure 2l the jaws wmbe the lined-4 0f Figure 3- brought together to iirmly grip a log orother Figure 5 iS an eleVatiUnal View ofthe drive rod object interposedBy agaln operating the hanconnected jaw.

'die 22, the valve 'i8 can be reversed and the steam or other uid' poweris utilized for retracting the jaws so that the log or other object canbemoved dog assembly.

to a new position or entirely displaced from the a guide block 3S beingshown in the act of 37,

a saw and thereon, the saw 35 cutting through a log claimed hereinafter.

Having described the invention, what is claimed as new is:

In a dog assembly for holding logs in sawf mills, a bedof two spacedrmly connected channels, a pair of coactmg jaws with interengaging blockI3 to a link bar id the block I3 being 'teeth' for equal opposingangular gripping mo provided with a slidecollar I5 operating on a 45tion on both sides of thelog and with opposing guide bar I6 supported bybridge members Il spanning. the channeled members 5, '5.

Numeral I8 denotes a reversing valve to which' a steam supply pipe I9ing a cut-01T valve 2B therein.

A'rotary shaft 2| valve I8 and this has a hand-bar 22 at itsouterconnects, this pipe havis provided for reversing the 6nd- A Steamexhaust pipe 23 leading from the' ing a workmg piston and piston rod,operating in cylinder has a cut-olf valve 24 therein. substantialparallelism to said bed a linkcon- The dOgSSembly itself as shown inFigure 3 55 nection between'said piston and one of said jaws.

a guide bar for said piston rod and for one end ot said link connectionon said bed, and valve Number means arranged above the cylinder foradmitting steam to the one or other side of the piston.

cLAUDE w. WALLACE.

A ARill', ELIENCESJ CITED The following references are of record in them me of this patent:

NrrED s'pA'rEs Arwrmvrs Name Date Per Nov. 12, 1889 Krebs Oct. 12, 1909Martin Oct. 10, -1933 Haase Jan. 23, 1934 Evrell Apr. 11, 1939 McRaeSept. 4, 1388 Smith Jan. 2B, 1890 Trout Jan. 29, 1918

